559 reputation
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bio website list.seqfan.eu
location FR
age 65
visits member for 5 years, 1 month
seen May 15 at 5:13
Administrator of the seqfan (Integer Sequences) mailing list and old contributor of Neil Sloane's O.E.I.S. (Wiki version here.)

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20
awarded  Nice Answer
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awarded  Necromancer
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awarded  Constituent
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awarded  Caucus
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awarded  Excavator
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awarded  Suffrage
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awarded  Citizen Patrol
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comment Mathematical ideas named after places
And there is the Syracusan Square which is a special case of Graeco-Latin square ...
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awarded  Nice Answer
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awarded  Yearling
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awarded  Necromancer
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awarded  Yearling
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accepted What is exactly the (singularity) confinement property ?
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awarded  Necromancer
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29
comment What are the most misleading alternate definitions in taught mathematics?
@Omar: This definition by subset of the product of domain and codomain is not only a trick. This is a good basis for combinatorial thinking and fits nicely with the various ways of counting fundamental objects.
May
29
comment What are the most misleading alternate definitions in taught mathematics?
@Christos: As previously commented there is the 3. about partitions of a set. There are cases where you better use def 1 to prove there is one. In fact we bother discussing many kinds of relations. Before introducing equivalence relations, you can take some time to define strict and inclusive order relations, which are antisymmetric. It prepares you to the fact that all these concepts are related. And is a good preparation for lattice theory.
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23
awarded  Enthusiast
May
21
comment Books you would like to see translated into English.
I am afraid these are (mathematically) of anecdotical interest and that Grothendieck has again recently vetoed translations and publications in any form of his magnus opus.
May
19
comment Does every finitely presentable group have a presentation that simultaneously minimizes the number of generators and number of relators?
Except for some classes of presentable groups which are decidable.
May
18
comment What should be offered in undergraduate mathematics that's currently not (or isn't usually)?
Of course I agree. But it should also don't hide that their are also functional and difference equations.